2024年10月2日(水) 20:37 Breno Leitao <leitao@xxxxxxxxxx>: > > Introduce a fault injection mechanism to force skb reallocation. The > primary goal is to catch bugs related to pointer invalidation after > potential skb reallocation. > > The fault injection mechanism aims to identify scenarios where callers > retain pointers to various headers in the skb but fail to reload these > pointers after calling a function that may reallocate the data. This > type of bug can lead to memory corruption or crashes if the old, > now-invalid pointers are used. > > By forcing reallocation through fault injection, we can stress-test code > paths and ensure proper pointer management after potential skb > reallocations. > > Add a hook for fault injection in the following functions: > > * pskb_trim_rcsum() > * pskb_may_pull_reason() > * pskb_trim() > > As the other fault injection mechanism, protect it under a debug Kconfig > called CONFIG_FAIL_SKB_FORCE_REALLOC. > > This patch was *heavily* inspired by Jakub's proposal from: > https://lore.kernel.org/all/20240719174140.47a868e6@xxxxxxxxxx/ > > CC: Akinobu Mita <akinobu.mita@xxxxxxxxx> > Suggested-by: Jakub Kicinski <kuba@xxxxxxxxxx> > Signed-off-by: Breno Leitao <leitao@xxxxxxxxxx> This new addition seems sensible. It might be more useful to have a filter that allows you to specify things like protocol family.
